Year	Number of
1990	919.16
1991	1015.15
1992	1122.62
1993	1241.73
1994	1375.75
1995	1527.16
1996	1674.99
1997	1838.05
1998	2018.04
1999	2217.26
2000	2438.61
2001	2588.16
2002	2747.26
2003	2918.53
2004	3103.93
2005	3307.28
2006	3556.41
2007	3829.29
2008	4138.08
2009	4471.97
2010	4830.77
2011	4991.65
2012	5158.24
2013	5328.21
2014	5505.51
2015	5692.28
2016	5893.45